Measurement of the branching fraction and search for and decays at Belle

We present a study of the rare charm meson decays , , and using a dataset collected by the Belle detector at the KEKB asymmetric-energy collider. We identify candidates via the charge of the pion from decays and normalize the branching fractions to decays. The branching fraction for decay is measured to be , with the dielectron mass in the mass region . We also search for ( , ) decays with the dielectron mass near the and resonances, and away from these resonances for the and modes. For these modes, we find no significant signals and set 90% confidence level upper limits on their branching fractions at the level.

Duke Scholars

Author Anselm G. Vossen Physics